A few thoughts: What do you get when you glue together a story about an old horror star on the brink of retirement with the story of a seemingly happy and regular looking guy who decides to go on a killing spree? You get Targets, a movie that would have worked far better as two individual movies, but somehow still manages to make for an interesting and weirdly insightful film regardless of the clunkiness. Drawing parallels between the classic horror monsters of movies from the Karloff era to the "modern" monster (by '60s standards), who is simply a man who one day finally snapped. Being a big fan of Karloff (WHO I SOMEHOW LEFT OFF MY TOP 100 ACTORS LIST?!?), I naturally found myself more drawn into his half of the story, which has an added weight when you consider he passed away only 6 months after this film's release. I wish the ending hadn't been so abrupt, but it was still a great note to end his career on -- as long as you choose to ignore the other crap he appeared in that was released after this.
Who would I recommend it to? People who like '60s thrillers or movies about movies should enjoy this one.